Furnace and grate



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(N0 Model.)

No. 561,729. Patented June 9,'1896,

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2. t e e h s w e e h s 3 N 0 S R E .D N A S G J. u. d 0 M o m FURNACE AD GRATE.

Patented June 9, .1896.

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J.G.SANDERS0N. l

(No Model.)

FURNAGE AND GRATB.

Patented June wms/Essfs.r Mmwzeg.

ANDREW BKGKNAM, PHOTO-UTKQWSMINETOMUQ by the tubular extension of the grate. This form of grate is supplied with the same means for raising and oscillating it as shown in Fig. 1, and in this form the air and steam pass into the combustion-chamber through the pas* sages formed by the corrugated and smooth r1ngs.

In Figs. 7, 8, and 9 I have shown another modification of my grate. In this form I arrange and secure upon one another bythe rod 13 and means shown in Fig. 5 a number of rings 33, formed with the projections 34 on their outer periphery, the lugs 35 on their lower faces, and with the openings 36 in their upper faces, and when the rings are secured together the projections S4 are in the same straight line one above the other, and the spaces intervening between them form the grooves 34A, as shown in Fig. 8. The lugs and openings are arranged on the rings in about the position shown. The lugs separate the rings to form lateral spaces between them through which air and steam pass, and the grooves 34a, which are in communication with the lateral passages, serve to conduct the air and steam up through the fuel. A further function of the lugs and openings :is to prevent the rings from turning one upon the other when the grate is oscillated. Th s form of grate is also supplied with the mea 1. for oscillating and raising it shown in Fig. l and 5.

24 represents the hopper, 25 the chute for feeding the fuel to the chamber 2, and 26 a valve for closing the opening at the `bottom of the hopper. As will be seen from Fig. 1, the chute 25 is placed centrally within the boiler and directly over the point of the grate, so that as the fuel is fed into the chamber it will be evenly distributed around in the chamber, as will be seen by the dotted lines in Fig. 1.

27 represents a steam-dome located on the boiler 1, and it may be, if desired, within the upper portion of the combustion-chamber, although I have shown it located outside of the furnace, and 28 a pipe leading therefrom to the passage 9, at which point the end is tapered to form a jet and turned inward so as to direct the steam through the passage and openings 33 in the grate extension.I By this arrangement a forced draft may be had in order to make the fire burn more rapidly when desired.

30 represents a water-glass, 3l a cock for drawing off water from the boiler, and 32 a feed-water inlet to the boiler, which is opened when the boiler is to be filled.

The operation of the apparatus is as fol lows: The hopper being supplied with fuel and the valve raised, the fuel falls through the chute onto the grate until the furnace is charged with fuel to the extent shown in dotted lines; but the hopper is filled to keep up a continuous supply of fuel. The fuel in the furnace being fired, combustion is aided by the draft through the passage 9 and the tubular extension of the grate, through the opening in the grate-head, .which distributes air throughout the fuel. Ordinarily, when the furnace is not being used to produce gas, the grate may bel turned so that the openings 33 will be more or less in direct communication with the passage 9 and in this manner regulate the draft. The ash and clinkers formed by combustion of the fuel are removed by raising and oscillating the grate by the means already described.

If the device is to be employed to produce gas, for which it is welladapted, steam is supplied with the air to the combustion-chamber, and as it passes through the burning coals it is decomposed, forming hydrocarbon gas. When the device is used for this purpose, it is necessary to reduce the supply of air, only such quantity being needed as is necessary for slow combustion of the fuel.

This may be accomplished by any suitable means. After the gas has passed up through the boiler it is conducted to where it is desired in the usual manner. The steam used for forming the gas 'may be taken from the steam-dome. It will also be seen that my furnace may be used for any of the purposes for which furnaces of the class are commonly employed.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. The combination of a grate, a rod secured thereto, a pivoted lever adaptedto carry the rod at one end, a number of elongated teeth carried by said grate and adapted to be engaged by a rack, and suitable means for reciprocating the rack, substantially as shown and described.

2. A grate having a conical head formed of plain and corrugated rings alternately ar-l ranged substantially as shown and described.

3. A hollow conical grate formed of plain and corrugated rings arranged alternately one upon the other, having draft-passages between the rings and provided with means for `oscillating the grate, substantially as shown and described.

4. In a furnace, the combination of a suitable boiler, a vertical fuel-magazine located in said furnace, a combustionchamber having a conical grate provided with a tubular portion having openings formed in it, located therein, said grate being hollow and having openings from the interior to the combustionchamber, a draft-passage in communication with the tubular portion of said grate, and suitable means for turning the grate so as to regulate the draft; substantially as and for the purpose set forth.

5. In a furnace, the combination of a combustion-chamber having a corrugated tapered lower end, a corrugated conical grate tting in the lower end of said combustion-chamber and having connected therewith suitable means for raising it within the combustion- IIO Y chamber and at the same time oscillating it, substantially asshown and described.

6. In a furnace the combination of a combustion-chamber having a tapered lower end, a grate having a conical head, a rod secured to said grate, a pivoted lever adapted to carry the rod at one end, and to be operated at its other end to raise the grate, a series of teeth carried by said grate, a rack in engagement therewithand a lever secured to the rack for reciprocating it, substantially as shown and described.

7. A conical grate made of a number of superposedrings resting one upon another with their parallel faces overlapped to prevent the escape of fuel and spaced apart to form lateral airpassages and having grooves on their surface in communication with the lateral air-passages, substantially as and for the purpose set forth.

S. A hollow conical grate formed of a number of superposed rings each being provided with opcnin gs and lugs, and with lateral projections for forming an intermediate space substantially as shown and described.

9. A hollow conical grate formed of a number of rings, each being provided With lugs and openings adapted to t in a corresponding opening and receive a corresponding lug on a superposed ring for the purpose of spacing the rings apart and prevent any relative movement of the rings,substantialljy7 as shown and described.

lO. A furnace having a fuelqnagazine, a combnstiom chamber With an inwardly-inclined base, a conical grate located beneath the magazine and Within the combustionchamber, a vertical rod supporting the said grate, a pivoted lever supporting the said rod, and a lever havin g means in connection therewith for revolving or oscillating the grate, substantially as shown and described.

JAMES GARDNER SAXDERSON.

/Vitnesses:

J. Amicus ROBERTSON, F. L. HITCHCOCK. 

